<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格区 -->
      <tree-table
        class="treeTable"
        :selection-type="false"
        :expand-type="false"
        :data="cateList"
        :columns="columns"
        show-index
        index-text="#"
        border
      >
        <!-- 是否有效 -->
        <template slot="isOk" slot-scope="scope">
          <i
            class="el-icon-success"
            v-show="scope.row.cat_deleted === false"
            style="color: green"
          ></i>
          <i
            class="el-icon-error"
            v-show="scope.row.cat_deleted === true"
            style="color: red"
          ></i>
        </template>

        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            type="success"
            size="mini"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>

        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit"
            >编辑</el-button
          >
          <el-button size="mini" type="danger" icon="el-icon-delete"
            >删除</el-button
          >
        </template>
      </tree-table>

      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <el-form
        :model="addCateRuleForm"
        :rules="addCateRuleFormRules"
        ref="addCateRuleFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateRuleForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- options代表数据源 -->
          <!-- props 用来指定配置对象 -->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            expandTrigger="hover"
            :props="cascaderProps"
            @change="cascaderChanged"
            change-on-select
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCase">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "Cate",
  created() {
    this.getCateList();
  },
  data() {
    return {
      cateList: [],
      queryInfo: {
        type: 3,
        pagesize: 5,
        pagenum: 1,
      },
      total: 0,
      // 为 table 指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          prop: "cat_deleted",
          type: "template",
          template: "isOk",
        },
        {
          label: "排序",
          prop: "cat_level",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      // 用于显示或隐藏添加分类对话框
      addCateDialogVisible: false,
      // 添加分类的表单对象
      addCateRuleForm: {
        cat_name: "",
        cat_level: 0,
        cat_pid: 0,
      },
      // 添加分类的规则对象
      addCateRuleFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      // 父级分类列表
      parentCateList: [],

      // 级联选择器选中的id列表
      selectedKeys: [],

      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
    };
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      });

      if (res.meta.status !== 200) {
        this.$message.error("获取商品分类失败！");
      }

      this.cateList = res.data.result;
      this.total = res.data.total;
    },

    // 当 pagesize 发生变化时调用的函数
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getCateList();
    },
    // 当 pagenum 发生变化时调用的函数
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },

    showAddCateDialog() {
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },

    // 获取 1 2 级分类列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: {
          type: 2,
        },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据失败！");
      }

      this.parentCateList = res.data;
    },
    // 当级联选择器值改变时调用
    cascaderChanged() {
      if (this.selectedKeys.length > 0) {
        this.addCateRuleForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ];
        this.addCateRuleForm.cat_level = this.selectedKeys.length;
      } else {
        this.addCateRuleForm.cat_pid = 0;
        this.addCateRuleForm.cat_level = 0;
      }
    },
    // 单击确定按钮，添加分类
    addCase() {
      this.$refs.addCateRuleFormRef.validate(async (valid) => {
        if (!valid) {
          return;
        }
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateRuleForm
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加分类失败！");
        }
        this.$message.success("添加分类成功！");
        this.getCateList();
        this.addCateDialogVisible = false;
      });
    },
    // 添加分类对话框关闭时的响应函数
    addCateDialogClosed() {
      this.$refs.addCateRuleFormRef.resetFields();
      this.selectedKeys = [];
      this.addCateRuleForm.cat_level = 0;
      this.addCateRuleForm.cat_pid = 0;
    },
  },
};
</script>

<style>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>